the Ichthyology of Australia. 495 



midway between the tip of the snout and base of the anal ; its first 

 four rays are graduated and closely incumbent on the base of the 

 fifth, without intervening membrane. The fifth is nearly as long as 

 the sixth and seventh, the more posterior ones again decrease in 

 length till the sixteenth, but the seventeenth and eighteenth are a 

 little longer, and the nineteenth is prolonged and tapers to a point, 

 which, when turned back, falls but little short of the base of the 

 caudal. It is about one-fourth longer than the sixth ray, is broader 

 than the rest, and is grooved behind so as to show very clearly 

 its binate structure : it has a short anterior branch, which is not 

 longer than the preceding ray. The anal is placed much further 

 back than the dorsal and has more rays, but is otherwise very simi- 

 larly constructed. Its last ray resembles the last one of the dorsal in 

 form, being forked, with the posterior portion wider, grooved and 

 tapering, but not much prolonged beyond the preceding rays. There 

 is a small fold of the skin above the upper ray of the ventral, pro- 

 ducing an acute ridge about half as long as the fin. No such ridge 

 can be perceived at the pectoral. 



Dimensions. inches . i ines . 



Length from snout to tip of caudal 9 2 



base of caudal 7 2 



anus 5 



beginning of dorsal or ventrals 3 1\ 



edge of gill-cover 1 9 



nape 1 6 



Diameter of eye 6J 



Length of dorsal 1 



Height of its sixth ray 1 5 



last ray 2 2 



Length of anal 1 3 



Height of its fifth and sixth rays 1 3 



last ray 6 



Length of caudal lobes 2 2 



caudal central rays 6 



pectorals > 1 5 



ventrals 1 1 



Rhombus lentiginosus (Nob.). 



Rh. lentiginosus ; cum pinnis verticalibus ellipticus ; pinna cauda; 

 rhomboidali, pinnis ventralibus invicem et a pinna anali discretis ; 

 oculis approximatis sinistris ; squamis apice ciliatis, singulis macula 

 lunata verticali notatis ; linea laterali super pinnam pectoralem cur- 

 vata, dein recta. 



Rad.-— Br. 7; D. 73 ; A. 59 ; C. 15|; P.l|ll; V.6. 



No. 35. Mr. Gilbert's list. 



This fish, which as far as I can ascertain is hitherto unde- 

 scribed, inhabits all parts of the harbour of Port Essington, 

 and the whole coast of Cobourg Peninsula. The Aborigines 

 name it " wooneerung." 



Its profile, excluding the vertical fins and extremely short trunk of 



